Pump mechanism for type-casting machines.



N0. 856,026. PATBNTED JUNE 4, 1907. P. H. BROWN, J. L'HANRAHAN & G. A. BOYDEN. PUMP MECHANISM FOR TYPE CASTING MACHINES.

' APPLICATION FILED MAY24,1904.

UNITED STATES PATENT OFFICE.

FRANK HOWARTH BROWN AND JOHN EDWARDHANRAHAN, OF BALTIMORE, AND GEORGE ALBERT BOYDEN, OF MOUNT WASHINGTON, MARYLAND, ASSIGNORS TO NATIONAL COMPOSITYPE COMPANY, OF BALTIMORE, MARYLAND, A CORPORATION OF DELAWARE.

PUMP MECHANISM FOR TYPE-CASTING MACHINES.

Patented June' 4, 1907.

Application nea may 24,1904. stanno. 209,523.'

To all whom it may concern.-

Be it known that we,FRANK Howxn'rn BROWN and JOHN EDWARD HANEAHAN, of Baltimore, Maryland, and GEORGE ALBERT BOYDENof Mount Washin ton, inthe county of Baltimore and State o Maryland, have invented. certain new and useful Improvements in Pump Mechanism for Type-Casting Machines; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to certain new and useful improvements in pump mechanism for t pe casting machines, and the invention has or its object to provide valve mechanism that will be positive in its action, both in admitting molten metal to the Well, and also preventing its escape back from the latter through the valve mechanism when the metal is being ej ected'into the mold.

-With the introductionof the sorts machine for casting type, invented by applicants, the art of producing type at the present time is being revolutionized, for the reason that instead of making type under the heretofore well known foundry practice with skilled labor, and then distributing'the type throughout the country for Vrinters to use, the printers are now pro ucing type in their' own offices with unskilled abor. This re-- sults in a great saving of time and money and affords convenience in procuring immediately type and sorts when needed. Said invention necessitated the creation of various systems and inventions, not only with relation to the type casting machine proper, but also to molds, mold making, matrices and matrix making, and to one of these systems the resent invention relates.

T e invention will be hereinafter fully set forth and particularly pointed out in the claims.

In the accompanying drawing z-Figure I is a sectional view of the metal receptacle of a type casting machine, illustrating the pump and the valve parts. Fig. 2 is a detail sectional view illustrating the valve stem and spider.

Referring to the drawing, 31 designates the metal receptacle which contains the the bore of t molten metal, the latter bein reduced toy and maintained in a molten con ition by a suitable heating medium, not shown. Said receptacle is provided with a nipple 35 through' Which the metal is injected mto the mold mechanism 170, which may be of any preferred construction. Within the nipple 35 is arranged a choker which acts as a valve lto cut off the metal between the nipple 35 and the mold 170, and said choker 1s also provided with a second valve 52 arranged to control the iiow of molten metal from the receptacle into the port leading to said nipple. The stem of the choker is rovided -w1th a groove 50 through which the molten metal passes to s aid port when the choker is in the osition illustrated in Fig. 1. VThe choker 50 1s actuated by a lever 55, suitably pivoted to the receptacle and having its lower end enF gaging with said choker, the upper end of said lever projecting into the path of a roller 55 mounted on the actuating lever 61. A downward movement of the lever 61 causes said roller,to engage the beveled end of said lever, rocking the latter, thereby causing the choker to move in a direction to open the oriiice in the nipple leading to the mold 170, and' simultaneously closing the passage from the metal receptacle to the port-endeading to the nipple. Therefore, when the lever 61 is forced downward, the valve 52 is closed, and molten metal prevented from passing therethrough back to the receptacle; at the same time the orifice in the a ex of the nipple is opened to permit the meta to pass through passage 53 to the mold.

To the actuating lever 61 is secured a valve stem arranged to impart motion to a pump plungxer 73, whichlatter is fitted into e Well 54, sufficiently tight to make a comparatively metal vtight joint. The lower portion of said stem is preferably formed as a valve 73 ada ted to seat itself on the top of plunger 73, whereby said valve, when in action is moved against the pressure in the well 74 to close the central bore with which said plunger is provided, From the valve 73 extends a stem 70 whichfis passed through the bore in the plunger 7 3 and cut away at its sides to form passages for the metal, whereby .the latter will pass from the receptacle 31 to the well 54, thus allowing TOO 4receptacle to the well, as

for a free. delivery of molten metal from the indicated by the arrows. On the end .of said stem is arranged a spider 74, of such formation that when rthepump mechanism is in the position illustrated, the moltenmetal is free-to ass from the bore of the plunger to the wel 54, as indicated by arrows. i

vWhen thegparts arein their normal positions, the valve end of the rod 70 is out of engagement with its seat upon the lunger 73, and molten metal is free to ass t ough the bore of said plunger. In t ofthe device, lever 61 is forced downward by any suitable means, the iirst action being to close valve 73 against the pressure of the metal in the well. Simultaneously with this action, the roller 55 engages the upper end of lever 55, causing the choker to be moved in a direction to close valve 52 and withdraw the forward end of the choker'from the opening in thel apex of the nipple 3.5.v The continued downward movement of -lever 61 causes the valve 73 to seat itself on the plunger 73, closing the bore thereofforcing said plunger downward, and therebyT ejecting molten metal from the well 54 throu h passagle 53 and nipple 35 into the mo d 170. W en the lever 61 isv raised or released the valve 7 3 is first lifted from its seat, thereby opening the bore and restablishing the as-l sage of the molten metal through the (punger, and as the latter moves upwar the moltenmetal flows from the receptacleto thewell 54. Simultaneously with the above movement, the choker is moved by 'to close the opening in the nipple the valven52, whereby the metal may also pass from the receptacle through the groove 50 in the stem of the choker, to the passa e 53. Thus the well 54 is quickly and entirely filled ready for thenext cast.

The advantages of our invention will be at once apparent to those skilled in the art to which 1t appertains. Itwill be particularly noted that by arranging the valve on the plunger stem to work against the pressure in the well, the resistance of the metal against the plunger always insures the valvebeing closed, and in the reverse action, when the pump is lifting, insures the opening .of the passage. Thus the action of the valve is positive and uniform, which is absolutely essential in practice, and a decided advantage. Many other forms ofl valves having e operation spring S and open erated in the pump well, .sai

been employedI in connection withl pump `mechanism for type casting machines, thesel latter valves, however, byy reason of their u'ncertain action being of little value for the-purpose designed.

It will also be' noted that the drawings are only employed for illustrative purposes, and the invention is not speciiical y imited to any of the structural features therein's'hown, or any other specific valve mechanism.

We claim as our invention z-` 1. 'Pump mechanism for type casting machines comprisin a ump plunger having a central bore, a va ve o r closlng said bore and moving said plunger against fessure generated in the pump well, said va ve being rovided with a stem passed through said ore and cut away at its sides, and a spider on the lower end of said stem and provided with means for permitting. molten metal to pass out of saidy bore when said valve is unseated.

2. Pump mechanism for type casting machines comprisin a ump plunger having a central bore, a va ve or closing said bore and moving said plunger against pressure generated in the pump well, said valve bein provided with a stem passed through said bore and cut away at its sides, and a'spider on the lower end of said stem and provided withraised portions, the spaces between said raised ortions forming channels for the passage oip seated.

chines comprisin a um plunger having a central bore, a va ve or c oslng ysaid bore and moving said plunger against (pressure gem valve being provided with a stem passed through said bore, means for permitting metal to flow through said bore around said stem, and a spider on the lower end of said stem and rovided with means for permitting mo ten metal to iiow out of sald bore when said valve is unseated. Y i

In testimony whereof, we have signed this specification in the presence of two subscribing witnesses.

FRANK HowAR'rH. BROWN. y JoHN 'EDWARD HANRAHAN. GEORGE ALBERT BoYDEN. Y

Witnesses: p EDWARD V.-HAX, WM. J. MCCAULEY.

molten metal when said valve is un-l 3. Pump mechanism for type casting mal 

